Blower wheel and impeller



April 26, 1938. M. I. LEvY Er AL ,1 4 BLOWER WHEEL AND IMPELLER Filed May 14, 1937 INVENTORS MAP/ON]. LEVY I 2 flew-Hue 5 NHEKAMPER' y ATTORNEY.

Patented Apr. .26 '1938 1 PATENT OFFICE 2,115,367 I BLOWER WHEEL AND IMPELLER Marion'L Levy, Cleveland, and Arthur Benne- 'kamper, Parma, Ohio, assignors to Viking Air Conditioning Corporation, Cleveland, Ohio Application May 14,- 1937, Serial No. 142, 03

11 Claims. (Cl. 230 -134) evenly set at the correct angle. Furthermore,

I UNiTE-D ISTATES This invention relates to blower wheels on centrifugal pumps or fans, and particularly to the rotor section technically known asthe' impeller.

The principal object of the invention is to proconstructing centrifugal type blowers.

Another object is tocon'struet blower wheels of a more durable structureand having a more "even dynamic andfrunning' balance. m A further object is to construct blower wheels,

utilizing a novel and simple "means for attaching Figure I is a prsp,ect iveview,of,thebl0wer wheel side ring showingposition of sockets embossed ercin;-' 1

. ringtakenalong line III-III of Figure IL. v

Figure IV is a sectional View of a side ring and blades showingstepsin assembling the same; Figure V is a sectional view of a side ring and a blade just before assemblytaken along line VV of Figure IV; 1 I

Figure VI is a sectional view of a side ring and a blade'after assembly taken along line VI-VI- of Figure IV;

Figure VIIis after the tab is squeezed into the embossed socket, taken along the line VII-VII of theFigure Figure VIII is a view of ablade showing formation of endsta'y and" tab on theend of a curved blade, taken along the line VIII'-YIII of Figu'reV."-" j Figure IX is a sectional view of a side ring and blade tab taken along the lines IXIX of Figure II, similar to the view of Figure VI, excepting that the bladetab is "shown as being welded in- 5 stead of peened to the side ring.

' 1 .Heretofore,,, in the manufacture of blower v wheels, it has been the practice in assembling the rotor section or 'impelle1., .t0 rivetihe blades to the side rings, or to have horizontal tabs on the blades extend through slots in the rings andbent over on the outside. Either of these methods of as r tl a d. a embl h e a te d n t unbalance the wheel. not always-be uniformly spaced and as a result, all of the blades were not always'parallel'or vide an economical and expeditious method of Figure II'is an, enlarged-view of asection'of a Figure III is a cross sectional view of a side a sectional view of a side ring The weld or rivets could the welding particularly, it being a manual operation, was not always uniform. Sometimes too 'much heat applied at one spotwould cause the the tabs-to engage all the slotssimultaneously. To get all the blades in the-proper position was time'cOn'surning and fans of this type of construction were therefore, expensive to manufactu're A slightly unbalanced wheel could operate reasonably well at comparatively low speeds, but in the more advanced types of blowers, and those -which depend upon high speed for efficiency and satisfactory operation, the blower wheel must be in dynamic balance at all-times and must be able to retain this balance without warping or being subject to distortion.

The'centrifugal type of blower wheel to which our invention relates consists of a shaft IS, on which is mounted by'means of the radial braces or spokes ill, the impeller section composed of the side rings II and the blades l2.

' The rings II, are stamped out of suitable flat metal; are in reality fiat uniformly circular endless hoops; and are embossed was to form channels .o1' sockets M on their inside surfaces. The

raised or embossed portion of they ring II, is somewhat quadrilateral in form and has two slots l5 and IS in the parallel sides. The sockets M are annularly and evenly spaced around the ring ll, are set at an angle, and somade that the longest side, having the slot 15 is easily reached,

to facilitate assembly. The sockets M are also deep enough to permit the tabs ll to go through the slots l5 and lfi easily and smoothly. The required embossment or lateral depth of the socket i4 is dependent upon the thickness of the metal at the tabs H. The uniformly correct angle at which the blades l2. are affixed to the rings I l, is easily controlled by the regular positioning of the shoulders of the end-stays l8 firmly against the rims of the sockets l5. I

The blades lZ-are also made of metal strips curved longitudinally and which have arcuate end-stays l8 and tabs I! on their curved ends.

The. end-stays i8 serve to strengthen the blade, preserve its curvature and acts as a guide for the correct positioning of the tab I! in the socket H. The tab ll attached to the end-stay I8 is somewhat pointed or triangular in shape and fits into the slots [5 and I6 as shown and is securely fastened therein by peening as indicated in the Figures VI and VII, or by welding, brazing or soldering asindicated by the character 20; 'in Figure IX. The weld, braze or solder should not extend out beyond the outside surface of the side ring, but should be confined within the embossed depression, herein termed a cup and designated by. the character 2|; otherwise the additional projecting metal might cause the blower wheel to lose its running balance when revolving at comparatively high speeds.

In the commercial assembly of a wheel, the: I two side rings II are placed in a jig and held parallel to each other; both ends of a blade, areattached to the two'rings simultaneously; and.

by means of the radial braces or spokes l9..

-Because.of the closeness of the-blades. I2 to I each other, the last-blade could not be conveniently installed, unless the tabs 01 thereon were .easilyaccessible to the slots l5." Therefore in placing the last blade it is necessary to slide the tabs thereon first in an axial direction between increased.

the-rings l I and then inan arcurate direction to engage the sockets.

speed at which the parts are assembled is greatly However, when the blower wheels are auto matically assembled, thetabs I'I would. not necessarily have to be pointed nor would the sockets l4, have to be embossed in. the particular angle -or be of the particular shape illustrated. .The

tabs IT, for instance could be square or round instead of asshown; orhave any other shape adaptive to automatic assembly.

While we have describedv theinvention in its preferred form, and while we have used certain terms and language, it is understood that the embodiment of the invention as described is merelyillustrative and is not to be construed in a limiting sense, as various changes may be made without departing from the spirit of the invention or the scope of the appended claims.

We claim: 1

1. A blower wheel, comprising in combination, side rings, each of the said side rings having a plurality of lateral sockets on their inside sur- .faces, a plurality of blades between the rings,

each of the blades having tabs engaging the ttaching I the shaft to the said blades.

By making the tabs-ll pointed and the entrance slot [5 longer the end-stays across the curved ends, and

said sockets, a shaft, and a'means for 2. A blower wheel, comprising in combination, side rings having a plurality of annularly spaced longitudinally embossed fiat sockets, a plurality of blades having tabs fastened in the said sockets, and a shaft attached to the said blades.

3. A blower wheel, comprising incombination,"

parallelsiderin'gs having a pluralltyofinwardly embossed sockets thereon, a plurality'of parallel blades having end tabs securely engaging the sockets, the said blades being annularly spaced between theside rings, a shaft projecting out.-

wardly through the centers of the side rings and a means for-attaching the shaft to the said blades. 4;". Ina-blower, an impeller, comprising incom bination, parallel side rings; the said side rings as being lateral to and on the inside of the said] rings, and a plurality of blades between the rings and having means, for engaging the saids'ocketsfi,

6. In a blower, an impeller, comprisingin com bination a plurality "of longitudinally curved bladeshaving'arcuate end-stays and pointed'tabs,

so i

and parallel side rings having means for securely engaging the said tabs."

'Z. In a blower wheel, an impelleryc'omp'risingg l 35 rality f annularly spaced longitudinally "em-'3- in combination, parallel side" rings having afplubossel fiat sockets thereon, and a plurality of longitudinallyfcurved blades, chesaid blades having arcurate end-stays and'tabs fitting the said sockets and securely fastened therein...-

bination, side rings having} a plurality of in-- wardly disposed'sockets, a plurality of blades,

and means on the said blades foruniforfnly eng gaging the said sockets.

40 8. In a blower,-an impeller, comprising meom- 7 a strip of metal: having curved ends, arcurate tabs projecting from the said'end-stays' 10. In a blower, an impeller blade; consisting of, a longitudinally curved strip, arcuate endstays extending laterally across the ends of the said end-stays. i 11. In a blower, an im'peller'rin consisting of a flat hoop having a plurality of annularly and" ions" to" the"surface of the hoop'and extending angularly to the circum'ierencethereof.

MA RION L'LEVY. I

strip, and tabs projecting diametrically from the BENNEKAM'PER; 1

I g 45 9. In a blower, an impeller blade, consisting of l 

